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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fee6e017ac4a48827f1d7984ce878b5c3e0d35e5a3cd927ae92ee21fe627c00' 
  AND token = 'SaOliOR8oWt+WqeGc0AIVZjSG7iL7+BRKFdiFoRDR3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}